Lost Wax Calculator from Dendritics

The Wax Calculator from Dendritics is a useful online resource for determining the weight of your cast gold item based on the weight of the wax design.

Optionally, input the current expense per troy ounce (in Us Dollars) or implement a markup/discount percentage.
The calculator will provide you with the estimated weight of the cast metal piece and its value. Keep in mind that this calculation does not contemplate any porosity in the casting1.

2. Romanoff’s Process for Metal Weight Determination
Romanoff, a trusted name in jewelry tools and supplies, provides a uncomplicated method for calculating the correct metal weight for investment casting:

Weigh your wax models along with the main and gate sprues.
Add an additional 10% to account for the button (the further metal essential for the sprue system).
Multiply the total mass by the particular gravity of the metal you’re casting (see the table below for distinct gravity values).
Example: For a 5-gram wax model, incorporate 0. 5 grams (10% of 5g) to have a total wax weight of 5. 5 grams.